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MS51FB9AE / MS51XB9AE / MS51XB9BE
Mar. 03, 2021 Page 1 of 346 Rev 1.04
M
S51
系列技术参考手册
1T 8051
8位微控制器
NuMicro
®
家族
MS51系列
MS51FB9AE
MS51XB9AE
MS51XB9BE
技术参考手册
The information described in this document is the exclusive intellectual property of
Nuvoton Technology Corporation and shall not be reproduced without permission from Nuvoton.
Nuvoton is providing this document only for reference purposes of NuMicro microcontroller based
system design. Nuvoton assumes no responsibility for errors or omissions.
All data and specifications are subject to change without notice.
For additional information or questions, please contact: Nuvoton Technology Corporation.
www.nuvoton.com

MS51FB9AE / MS51XB9AE / MS51XB9BE
Mar. 03, 2021 Page 2 of 346 Rev 1.04
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目录
1 概述 .................................................................................................................. 9
2 特性 ................................................................................................................ 10
3 料号信息 ......................................................................................................... 13
3.1 封装类型 ........................................................................................................................ 13
3.2 MS51系列选型指南 ..................................................................................................... 13
3.3 MS51 命名规则 ............................................................................................................ 14
4 引脚配置 ......................................................................................................... 15
4.1 MS51FB9AE / MS51XB9AE / MS51XB9BE 引脚配置 .......................................... 15
4.1.1 TSSOP 20脚封装引脚信息 ............................................................................................ 15
4.1.2 QFN 20脚封装引脚信息 ................................................................................................. 16
4.2 MS51FB9AE / MS51XB9AE / MS51XB9BE 系列引脚描述 .................................. 18
5 功能框图 ......................................................................................................... 21
5.1 MS51FB9AE / MS51XB9AE / MS51XB9BE 系列框图 .......................................... 21
6 功能描述 ......................................................................................................... 22
6.1 内存架构 ........................................................................................................................ 22
6.1.1 程序内存 (APROM / LDROM) ................................................................................. 22
6.1.2 非易失性数据存储 (DataFlash) ..................................................................................... 23
6.1.3 安全保护存储器(SPROM) ............................................................................................. 23
6.1.4 配置字 (CONFIG) ...................................................................................................... 24
6.1.5 数据内存 (RAM) .............................................................................................................. 29
6.1.6 特殊功能寄存器(SFR) .................................................................................................... 31
6.2 系统管理 ...................................................................................................................... 156
6.2.1 时钟系统 ......................................................................................................................... 156
6.2.2 电源管理 ......................................................................................................................... 160
6.2.3 电源监控及复位 ............................................................................................................. 161
6.2.4 中断系统 ......................................................................................................................... 171
6.3 Flash 存储控制 ........................................................................................................... 185
6.3.1 在应用编程 (IAP) .......................................................................................................... 185
6.3.2 在线电路编程 (ICP) ...................................................................................................... 196
6.3.3 片上调试 (OCD) ............................................................................................................ 196
6.3.4 96位序列号(UID) ........................................................................................................... 197
6.4 I/O 端口结构和工作模式 ........................................................................................... 198
6.4.1 GPIO 模式 ..................................................................................................................... 198
6.4.2 控制寄存器 ..................................................................................................................... 199
6.4.3 管脚中断 ......................................................................................................................... 203

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6.5 定时器 .......................................................................................................................... 209
6.5.1 定时器/计数器 0 和 1 .................................................................................................... 209
6.5.2 定时器 2 和输入捕获 .................................................................................................... 219
6.5.3 定时器 3 ......................................................................................................................... 237
6.6 看门狗定时器 (WDT) ................................................................................................. 239
6.6.1 看门狗定时器结构描述 ................................................................................................. 239
6.6.2 超时复位定时器 ............................................................................................................. 240
6.6.3 通用定时器 ..................................................................................................................... 240
6.6.4 控制寄存器 ..................................................................................................................... 241
6.7 自唤醒定时器 (WKT) ................................................................................................. 243
6.7.1 WKT 结构描述 ............................................................................................................... 243
6.7.2 控制寄存器 ..................................................................................................................... 244
6.8 脉冲宽度调制 (PWM) ................................................................................................ 247
6.8.1 概述 ................................................................................................................................ 247
6.8.2 功能描述 ......................................................................................................................... 247
6.8.3 控制寄存器 ..................................................................................................................... 254
6.9 串口 (UART0 & UART1) ........................................................................................... 267
6.9.1 概述 ................................................................................................................................ 267
6.9.2 功能描述 ......................................................................................................................... 267
6.9.3 控制寄存器 ..................................................................................................................... 275
6.10 I
2
C 总线(I
2
C) ......................................................................................................... 286
6.10.1 概述 ................................................................................................................................ 286
6.10.2 功能描述 ......................................................................................................................... 286
6.10.3 控制寄存器 ..................................................................................................................... 296
6.10.4 I
2
C 中断服务程序典型结构范例 .................................................................................. 301
6.11 串行外围总线(SPI) ............................................................................................... 305
6.11.1 概述 ................................................................................................................................ 305
6.11.2 结构框图 ......................................................................................................................... 305
6.11.3 功能描述 ......................................................................................................................... 305
6.11.4 控制寄存器 ..................................................................................................................... 311
6.12 12位模数转换器(ADC) ........................................................................................ 315
6.12.1 概述 ................................................................................................................................ 315
6.12.2 结构框图 ......................................................................................................................... 315
6.12.3 功能描述 ......................................................................................................................... 316
6.12.4 控制寄存器 ..................................................................................................................... 318
6.13 指令集 .................................................................................................................... 327
6.13.1 指令集概述 ..................................................................................................................... 327
6.13.2 指令集表 ......................................................................................................................... 327

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6.13.3 普通 80C51 系统控制 ................................................................................................... 330
7 应用电路 ....................................................................................................... 338
7.1 供电电路 ...................................................................................................................... 338
7.2 外设应用电路 .............................................................................................................. 339
8 电气特性 ....................................................................................................... 340
9 封装信息 ....................................................................................................... 341
9.1 TSSOP 20-pin (4.4 x 6.5 x 0.9 mm) ...................................................................... 341
9.2 QFN 20-pin (3.0 x 3.0 x 0.8 mm) for MS51XB9AE .............................................. 342
9.3 QFN 20-pin (3.0 x 3.0 x 0.6mm) for MS51XB9BE ............................................... 343
10 缩写词列表 ................................................................................................... 344
10.1 缩写词列表 ............................................................................................................ 344
11 历史版本信息 ................................................................................................ 345

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Mar. 03, 2021 Page 5 of 346 Rev 1.04
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图 集
图 4.1-1 TSSOP-20 封装引脚信息 ................................................................................................ 15
图 4.1-2 QFN-20 封装引脚信息 ..................................................................................................... 16
图 4.1-3 QFN-20 封装引脚信息 ..................................................................................................... 17
图 5.1-1结构框图 ........................................................................................................................... 21
图 6.1-1 MS51程序内存分配图 ...................................................................................................... 23
图 6.1-2 SPROM 存储器及SPROM 保护模式 ............................................................................... 24
图 6.1-3 CONFIG0 复位后自动重载 .............................................................................................. 25
图 6.1-4 CONFIG2 上电复位重载位 .............................................................................................. 27
图 6.1-5 数据内存分配图 ............................................................................................................... 29
图 6.1-6 内部 256 字节 RAM 地址 ................................................................................................. 30
图 6.2-1 时钟系统框图 ................................................................................................................. 156
图 6.2-2 欠压检测框图 ................................................................................................................. 162
图 6.2-3 nRESET 复位波形 ......................................................................................................... 166
图 6.2-4 启动选择结构图 ............................................................................................................. 169
图 6.4-1准双向模式结构 .............................................................................................................. 198
图 6.4-2 推挽模式结构 ................................................................................................................. 199
图 6.4-3输入模式结构 .................................................................................................................. 199
图 6.4-4开漏模式结构 .................................................................................................................. 199
图 6.4-5管脚中断模块框图 ........................................................................................................... 204
图 6.5-1 定时器/计数器 0 和 1 的模式 0 ...................................................................................... 209
图 6.5-2 定时器/计数器 0 和 1 的模式 1 ...................................................................................... 210
图 6.5-3定时器/计数器 0 和 1 的模式2 ........................................................................................ 210
图 6.5-4 定时器/计数器 0 的模式 3 .............................................................................................. 211
图 6.5-5 定时器 2 框图 ................................................................................................................ 219
图 6.5-6 定时器 2 自动重载模式 和输入捕获模块功能框图 ......................................................... 220
图 6.5-7 定时器 2 比较模式和输入捕获模块功能框图 ................................................................. 221
图 6.5-8 定时器 3 框图 ................................................................................................................ 237
图 6.6-1 WDT作为超时复位定时器 .............................................................................................. 240
图 6.6-2看门狗定时器框图 ........................................................................................................... 240
图 6.7-1 自唤醒定时器框图 .......................................................................................................... 243
图 6.8-1 PWM 结构框图 .............................................................................................................. 248
图 6.8-2 PWM和故障刹车输出控制方框图 .................................................................................. 249
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